You can restore transactions from a transaction log up to and including a named transaction (or mark). After the named transaction is reached, recovery from the transaction log is stopped.
Since named transactions do not necessarily have unique names, you can also specify a date and time after which the restore operation is to search for the named transaction. For example, if you specify a restore from a log up to the named transaction AfternoonBreak, found after 6/02/2000, 12:01 p.m., then the restore operation will not search for AfternoonBreak until after that time. To find dates and times of named transactions, check your client application event log.
If the named transaction is not found, then the restore operation succeeds, but a warning is generated and the database remains in an intermediate state.
The names of transactions are case-sensitive. Make sure you enter the correct upper- and lower-case characters when specifying a named transaction.
See How to restore from SQL transaction logs up to a named transaction.